Efeito da pulsação de corrente sobre a microestrutua da zona fundida na soldagem dissimilar entre o aço inoxidável ferrítico AISI 444 e o aço inoxidável austenítico AISI 316L.

Abstract

The objective of this study is to investigate the effect of pulse current on the microstructure of the fusion zone of dissimilar welds between the AISI 444 ferritic stainless steel and AISI 316L austenitic steel. Thin plates of the respective steels were joint by the TIG process. The welds were made varying the pulse frequency from 2 to 8 and without pulse, maintaining constant the heat input. The characterization of the microstructure was performed using the techniques of optical microscopy, MEV, EDS and EBSD. The results demonstrated that there was an effect of pulsed frequency on homogeneity and final microstructure in the fusion zone.